JPH0312380Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pig receiver of a pig device for removing or cleaning residual liquid in a pipeline for transporting fluid such as oil.

(Prior art) Conventionally, a pig device used for removing residual liquid or cleaning in a pipeline for transporting oil has been designed to connect a pig launcher and a pig receiver installed at the front and rear of the line pipe with an outer diameter that is slightly larger than the inner diameter of the pipe. This was done by force-feeding molded objects such as rubber called pigs (hereinafter abbreviated as "pigs") of various shapes suitable for cleaning the inside of pipes. Since the pig is attached to the outside of the transport pipe like the one shown in Publication No. 49829, it is necessary to take the pig out of the pig receiver and transport it to the pig launcher again each time the above operation is performed. Therefore, the effort required to send the pig back increases in proportion to the distance the line pipe is laid, and the cost involved increases.

(Problem to be solved by the invention) This invention is an improvement over the conventional one described above, and aims to eliminate the need for labor in the means of returning pigs and reduce the costs involved. be.

(Means for Solving the Problem) In order to achieve the above object, the pig receiver of this invention has the same inner diameter as the outer end of the line pipe and is sealed at the rear end, as shown in the drawing. A stopper 2 is attached to the middle part of the pig receiver 1, which prevents the pig from moving.
The stopper 2 is provided with an opening 3 that provides strength to withstand the impact when the pig is fed from the pig launcher side, and also allows residual liquid etc. to pass through.
Further, the rear chamber of the pig receiver 1, which is partitioned into front and rear chambers by the stopper 2, is provided with a nozzle 7 for supplying return air and a drain hole 12, respectively.

(Function) Next, to explain the function, when removing residual liquid or cleaning, the pig loaded from the pig launcher side passes through the line pipe and remains inside the pipe due to the compressed air etc. that is injected from the launcher side. After pushing out the oil or other unnecessary substances to the pig receiver side and pushing this further backward from the opening of the pig stopper, the pig comes into contact with the stopper and its movement is blocked, and the pressurized air is discharged from the air vent hole. The drain in front of the pig passes through the opening and is discharged outside from the drain outlet.

Next, in this state, if pressurized air or the like is injected from the nozzle on the rear chamber side of the pig receiver, the pig is moved backward and returned to the launcher side.

(Embodiment) This invention will be explained in more detail with reference to the embodiment shown in the drawings. Reference numeral 1 denotes a pig receiver, which is attached to the downstream end of a line pipe (not shown).

Reference numeral 2 denotes a pig stopper fixed at a predetermined position of the pig receiver 1, that is, at the middle part of the pig receiver 1, and has an opening 3 at an appropriate portion to receive the pig 4 being pumped through the pipe and simultaneously extrude it. The structure is designed to allow residual liquid, etc. to pass through.

Reference numeral 5 denotes a fixing device, which fixes the peripheral portion of the stopper 2 to the pig receiver 1 at an intermediate portion within the pig receiver 1.

7 is a nozzle for sending compressed air, etc. when returning the pig 4 from the pig receiver 1 side to the pig launcher side, 8 is a pressure gauge, 9 is an air vent hole, and 10 is a nozzle that indicates that the pig 4 has reached the receiver 1 side. 11 is the stand, 12 is the drain outlet.

A stopper valve or the like is installed at the rear end of the pig receiver or in the pipe connected to the rear end, so that the rear part of the pig receiver can be sealed when returning the pig.

In the pig receiver 1 shown in this embodiment, a pig 4 loaded from the direction of the arrow on the left side of FIG. , go further and stopper 2
to stop its movement.

Further, after lowering the pressure inside the pig receiver 1, if compressed air is blown through the nozzle 7, the pig 4 is returned through the line pipe through the opening 3 of the stopper 2. In this way, the pig 4 returned to the launcher side is prepared to be sent under pressure to the pig receiver 1 side again.

(Effect of the invention) As described above, it is possible to move the pig back and forth between the launcher side and the receiver side without taking it out from the pipe, so there is no need for labor to return the pig as in the past. Moreover, if the cleaning inside the pipe and the removal of residual liquid are automated by combining it with a control mechanism, it will be possible to further save labor.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal side view of a pig receiver according to an embodiment of the invention, and FIGS. 2 and 3 are a front view and a longitudinal side view of a pig stopper. 1: Pig receiver, 2: Stopper, 3: Opening, 4: Pig, 7: Compressed air feeding nozzle, 1
0: Air vent hole, 12: Drain vent hole.

Claims (1)

[Scope of utility model registration request] A stopper to prevent the pig from moving is installed in the middle of the pig receiver, which has the same inner diameter as the line pipe and whose rear end can be sealed, and which can be attached to the outer end of the line pipe.The stopper has an opening for fluid passage. 1. A pig receiver for a pipeline pig device, which is provided with a nozzle for feeding return air and a drain hole in a rear chamber of the pig receiver partitioned by the stopper.